Abstract
Free electron lasers (FELs) operate over a large portion of the electromagnetic spectrum, i.e. from the μ-wave to the UV. At the high frequency end of the spectrum, FEL operation is severely limited by a number of factors; prominent among them is the electron beam quality (electron axial velocity spread). The axial velocity spread is due to the electron beam's intrinsic energy spread and emittance. The general wavelength limitation in FELs due to electron beam quality is discussed. A method for reducing the axial velocity spread is proposed and analysed. This beam conditioning method redistributes the electrons' energy according to their betatron amplitude. This accomplished by interacting the beam with an axially symmetric, slow, TM waveguide mode.
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